[thirdparty/git.git] / git-difftool.perl

#!/usr/bin/env perl
# Copyright (c) 2009, 2010 David Aguilar
#
# This is a wrapper around the GIT_EXTERNAL_DIFF-compatible
# git-difftool--helper script.
#
# This script exports GIT_EXTERNAL_DIFF and GIT_PAGER for use by git.
# GIT_DIFFTOOL_NO_PROMPT, GIT_DIFFTOOL_PROMPT, and GIT_DIFF_TOOL
# are exported for use by git-difftool--helper.
#
# Any arguments that are unknown to this script are forwarded to 'git diff'.

use strict;
use warnings;
use Cwd qw(abs_path);
use File::Basename qw(dirname);

require Git;

my $DIR = abs_path(dirname($0));


sub usage
{
	print << 'USAGE';
usage: git difftool [-t|--tool=<tool>] [-x|--extcmd=<cmd>]
                    [-y|--no-prompt]   [-g|--gui]
                    ['git diff' options]
USAGE
	exit 1;
}

sub setup_environment
{
	$ENV{PATH} = "$DIR:$ENV{PATH}";
	$ENV{GIT_PAGER} = '';
	$ENV{GIT_EXTERNAL_DIFF} = 'git-difftool--helper';
}

sub exe
{
	my $exe = shift;
	if ($^O eq 'MSWin32' || $^O eq 'msys') {
		return "$exe.exe";
	}
	return $exe;
}

sub generate_command
{
	my @command = (exe('git'), 'diff');
	my $skip_next = 0;
	my $idx = -1;
	for my $arg (@ARGV) {
		$idx++;
		if ($skip_next) {
			$skip_next = 0;
			next;
		}
		if ($arg eq '-t' || $arg eq '--tool') {
			usage() if $#ARGV <= $idx;
			$ENV{GIT_DIFF_TOOL} = $ARGV[$idx + 1];
			$skip_next = 1;
			next;
		}
		if ($arg =~ /^--tool=/) {
			$ENV{GIT_DIFF_TOOL} = substr($arg, 7);
			next;
		}
		if ($arg eq '-x' || $arg eq '--extcmd') {
			usage() if $#ARGV <= $idx;
			$ENV{GIT_DIFFTOOL_EXTCMD} = $ARGV[$idx + 1];
			$skip_next = 1;
			next;
		}
		if ($arg =~ /^--extcmd=/) {
			$ENV{GIT_DIFFTOOL_EXTCMD} = substr($arg, 9);
			next;
		}
		if ($arg eq '-g' || $arg eq '--gui') {
			eval {
				my $tool = Git::command_oneline('config',
				                                'diff.guitool');
				if (length($tool)) {
					$ENV{GIT_DIFF_TOOL} = $tool;
				}
			};
			next;
		}
		if ($arg eq '-y' || $arg eq '--no-prompt') {
			$ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true';
			delete $ENV{GIT_DIFFTOOL_PROMPT};
			next;
		}
		if ($arg eq '--prompt') {
			$ENV{GIT_DIFFTOOL_PROMPT} = 'true';
			delete $ENV{GIT_DIFFTOOL_NO_PROMPT};
			next;
		}
		if ($arg eq '-h' || $arg eq '--help') {
			usage();
		}
		push @command, $arg;
	}
	return @command
}

setup_environment();

# ActiveState Perl for Win32 does not implement POSIX semantics of
# exec* system call. It just spawns the given executable and finishes
# the starting program, exiting with code 0.
# system will at least catch the errors returned by git diff,
# allowing the caller of git difftool better handling of failures.
my $rc = system(generate_command());
exit($rc | ($rc >> 8));
Commit	Line	Data
5c38ea31	1	#!/usr/bin/env perl
f47f1e2c	2	# Copyright (c) 2009, 2010 David Aguilar
5c38ea31 DA	3	#
5c38ea31 DA	4	# This is a wrapper around the GIT_EXTERNAL_DIFF-compatible
a904392e DA	5	# git-difftool--helper script.
	6	#
	7	# This script exports GIT_EXTERNAL_DIFF and GIT_PAGER for use by git.
	8	# GIT_DIFFTOOL_NO_PROMPT, GIT_DIFFTOOL_PROMPT, and GIT_DIFF_TOOL
	9	# are exported for use by git-difftool--helper.
	10	#
5c38ea31 DA	11	# Any arguments that are unknown to this script are forwarded to 'git diff'.
	12
	13	use strict;
	14	use warnings;
	15	use Cwd qw(abs_path);
	16	use File::Basename qw(dirname);
	17
4cefa495 DA	18	require Git;
4cefa495 DA	19
5c38ea31 DA	20	my $DIR = abs_path(dirname($0));
	21
	22
	23	sub usage
	24	{
	25	print << 'USAGE';
f47f1e2c DA	26	usage: git difftool [-t\|--tool=<tool>] [-x\|--extcmd=<cmd>]
	27	[-y\|--no-prompt] [-g\|--gui]
	28	['git diff' options]
5c38ea31 DA	29	USAGE
	30	exit 1;
	31	}
	32
	33	sub setup_environment
	34	{
	35	$ENV{PATH} = "$DIR:$ENV{PATH}";
	36	$ENV{GIT_PAGER} = '';
afcbc8e7	37	$ENV{GIT_EXTERNAL_DIFF} = 'git-difftool--helper';
5c38ea31 DA	38	}
	39
	40	sub exe
	41	{
	42	my $exe = shift;
46ae156d DA	43	if ($^O eq 'MSWin32' \|\| $^O eq 'msys') {
	44	return "$exe.exe";
	45	}
	46	return $exe;
5c38ea31 DA	47	}
	48
	49	sub generate_command
	50	{
	51	my @command = (exe('git'), 'diff');
	52	my $skip_next = 0;
	53	my $idx = -1;
	54	for my $arg (@ARGV) {
	55	$idx++;
	56	if ($skip_next) {
	57	$skip_next = 0;
	58	next;
	59	}
46ae156d	60	if ($arg eq '-t' \|\| $arg eq '--tool') {
5c38ea31	61	usage() if $#ARGV <= $idx;
2464456a	62	$ENV{GIT_DIFF_TOOL} = $ARGV[$idx + 1];
5c38ea31 DA	63	$skip_next = 1;
	64	next;
	65	}
	66	if ($arg =~ /^--tool=/) {
2464456a	67	$ENV{GIT_DIFF_TOOL} = substr($arg, 7);
5c38ea31 DA	68	next;
5c38ea31 DA	69	}
f47f1e2c DA	70	if ($arg eq '-x' \|\| $arg eq '--extcmd') {
	71	usage() if $#ARGV <= $idx;
	72	$ENV{GIT_DIFFTOOL_EXTCMD} = $ARGV[$idx + 1];
	73	$skip_next = 1;
	74	next;
	75	}
	76	if ($arg =~ /^--extcmd=/) {
	77	$ENV{GIT_DIFFTOOL_EXTCMD} = substr($arg, 9);
	78	next;
	79	}
4cefa495	80	if ($arg eq '-g' \|\| $arg eq '--gui') {
42accaec DA	81	eval {
	82	my $tool = Git::command_oneline('config',
	83	'diff.guitool');
	84	if (length($tool)) {
	85	$ENV{GIT_DIFF_TOOL} = $tool;
	86	}
	87	};
4cefa495 DA	88	next;
4cefa495 DA	89	}
8b733222	90	if ($arg eq '-y' \|\| $arg eq '--no-prompt') {
5c38ea31	91	$ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true';
a904392e DA	92	delete $ENV{GIT_DIFFTOOL_PROMPT};
	93	next;
	94	}
	95	if ($arg eq '--prompt') {
	96	$ENV{GIT_DIFFTOOL_PROMPT} = 'true';
	97	delete $ENV{GIT_DIFFTOOL_NO_PROMPT};
5c38ea31 DA	98	next;
5c38ea31 DA	99	}
8b733222	100	if ($arg eq '-h' \|\| $arg eq '--help') {
5c38ea31 DA	101	usage();
	102	}
	103	push @command, $arg;
	104	}
	105	return @command
	106	}
	107
	108	setup_environment();
677fbff8 AR	109
	110	# ActiveState Perl for Win32 does not implement POSIX semantics of
	111	# exec* system call. It just spawns the given executable and finishes
	112	# the starting program, exiting with code 0.
	113	# system will at least catch the errors returned by git diff,
	114	# allowing the caller of git difftool better handling of failures.
e8d11804 AR	115	my $rc = system(generate_command());
e8d11804 AR	116	exit($rc \| ($rc >> 8));